Part A)
In order to adjust the buffer pH to 8.65, should you add NaOH or HCl to the buffer mixture?
- Correct Answer: HCL
Part B)
What mass of the correct reagent should you add?
Express your answer using two significant figures.
Homework Answers
The pOH of basic buffer is given by pOH = pKb + log(NH4Cl/NH3)
= -log(1.76*10^-5) + log(0.30/0.30)
The pOH of given basic buffer is 4.75
In order to adjust the buffer pH to 8.65, we should add HCl to the buffer mixture
If x is the moles of HCl added to the buffer solution, it reacts with NH3 to form NH4Cl so that there is a decrease in the concentration of the NH3 by x moles and increase in the concentration of NH4Cl by x moles.
pH is given as 8.65. ======> pOH = 14-8.65 =5.35
pOH = pKb + log(NH4Cl/NH3)
5.35 = -log(1.76*10^-5) + log(0.30+x/0.30-x)
number of moles of HCl added (x) = 0.178 moles
The mass of the correct reagent(HCl) should be added =0.178*36.5 = 6.5 grams
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